[wp-trac] [WordPress Trac] #50042: Update Docker environment to allow specific versions of PHPUnit to be loaded

[WordPress Trac]

#50042: Update Docker environment to allow specific versions of PHPUnit to be
loaded
------------------------------+---------------------
 Reporter:  desrosj           |       Owner:  (none)
     Type:  task (blessed)    |      Status:  new
 Priority:  normal            |   Milestone:  5.5
Component:  Build/Test Tools  |     Version:
 Severity:  normal            |  Resolution:
 Keywords:  has-patch         |     Focuses:
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Comment (by desrosj):

 Besides using this and changing the version of PHPUnit locally in the
 `.env` file, Travis jobs can be updated as such:

 {{{
 - env: LOCAL_PHP=7.0-fpm LOCAL_PHPUNIT=6-php-7.0-fpm WP_TRAVISCI=test:php
 }}}

 For older branches (4.7-5.0), PHPUnit 6 is required for PHP 7.0. This
 would ensure the required version is installed.

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Ticket URL: <https://core.trac.wordpress.org/ticket/50042#comment:1>
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